I am going to have my seat reupholstered and while the seat and back are out I am going to install lap belts. I checked on Amazon and eBay and there are many lengths and brands, some just for golf carts. Can anyone tell me what worked for you, length and brand? My truck is a 51 Chevy 3600 and I am a thin guy. I would hate to buy the wrong size and have to send them back.